Starting April 1, USPS began implementing new service standards for first-class mail, periodicals, marketing mail, and package services.

The U.S. Postal Service has made changes in the ways it delivers mail in an effort to streamline operations and drive down costs by tens of billions of dollars over the next decade.

The price of first-class U.S. mail stamps will rise on Sunday to 73 cents from 68 cents, the latest in a series of price hikes.

The United States Postal Service will implement “refined service standards” for mail that is expected to save the agency $36 billion over the next 10 years.

Beginning April 1, service standard adjustments will be made for first-class mail, marketing mail, periodicals and package services, the Postal Service announced in a news release.

The biggest change comes in how First-Class mail, periodicals, marketing mail, and package services are delivered throughout the country.